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	Breaking the sound barrier: Home: News and Events
		As part of its 'Breaking the Sound Barrier' Campaign, RNID Cymru, the charity representing the 480,000 deaf and hard of hearing people in Wales, will be in the centre of Cardiff on 7 December between 9.30 and 4.30 pm.
		As part of its award-winning Breaking the Sound Barrier campaign in the run-up to St Andrew’s Day (30 November 2006), RNID Scotland is calling on people to nominate their favourite 'Sound of Scotland'.
		As part of its award winning Breaking the Sound Barrier campaign, RNID Cymru is calling on people to nominate their favourite ‘Sound of Wales’.
	www.breakingthesoundbarrier.org.uk /home/news (625 words)

	Privately Funded SpaceShipOne Breaks Sound Barrier
		A privately financed passenger-carrying sub-orbital rocket plane screamed its way through the sound barrier today, the 100th anniversary of the Wright Brothers historic 12-second flight over Kitty Hawk, North Carolina.
		Nine seconds later, SpaceShipOne broke the sound barrier and continued its steep powered ascent.
		At motor shutdown, 15 seconds after ignition, SpaceShipOne was climbing at a 60-degree angle and flying near 1.2 Mach (930 mph).
	www.space.com /businesstechnology/technology/rutan_update_031217.html (383 words)

	Sonic Boom, Sound Barrier, and Prandtl-Glauert Condensation Clouds (Site not responding. Last check: )
		The idea of a sound barrier is something that has caught the public's imagination and has been represented in many ways.
		The sound barrier can be seen in the sketch at the right which depicts a scaled version of the drag force acting on objects traveling at speeds near the speed of sound.
		A second contribution to the drag associated with the sound barrier is due to the fact that the disturbance due to the wing and even the generation of lift will cause shock waves to appear in the flow.
	www.fluidmech.net /tutorials/sonic/soundbarrier.htm (1000 words)

	Sound barrier - Wikipedia, the free encyclopedia
		In aerodynamics, the sound barrier is the transition at transonic speeds from subsonic to supersonic travel (usually refers to flight).
		The sound barrier was first broken in a vehicle in a sustained way on land in 1948 by a rocket-powered test vehicle at Muroc Air Force Base (now Edwards AFB) in California.
		Chuck Yeager was the first man to break the sound barrier in level flight on October 14, 1947, flying the experimental Bell X-1 at Mach 1 at an altitude of 45,000 feet (13.7 km).
	en.wikipedia.org /wiki/sound_barrier (1217 words)

	NationMaster - Encyclopedia: Sound barrier
		He claimed to be the first person to break the sound barrier and to achieve supersonic flight, although this claim is...
		In aerodynamics, the sound barrier is the apparent physical boundary stopping large objects from becoming supersonic.
		Sound velocity c or velocity of sound should not be confused with sound particle velocity v, which is the velocity of the individual particles.
	www.nationmaster.com /encyclopedia/Sound-barrier (2951 words)

	Decorative Precast Concrete Sound Barrier Walls
		Sound barrier walls, also known as sound walls, noise barriers, acoustical barriers and sound berms, are designed to protect the public against noise pollution.
		Sound walls are constructed from earth, masonry or precast concrete.
		When sound barrier walls are constructed, they must be built on approved land sites such as on privately owned land approved by the owner or on public right-of-way land areas approved by those with the proper jurisdiction.
	www.aftec.com /sound_wall_barriers.php (525 words)

	Absorptive Barriers are Better than Reflective Barriers (Site not responding. Last check: )
		A barrier wall such as the LSE 2000 with a porous surface material and sound-dampening content material is said to be absorptive.
		In this situation, it is a common phenomenon for one to perceive a difference in sound after a barrier is installed on the opposite side of a roadway.
		Individuals on the opposite side of the roadway may perceive a change in the quality of the sound; the signature of the reflected sound may differ from that of the source due to a change in frequency content upon reflection.
	www.soundfighter.com /reflective_vs_absorptive_sound_walls.aspx (479 words)

	sound barrier - Hutchinson encyclopedia article about sound barrier
		The Bell X-1 plane, famed as US test pilot Chuck Yeager's ‘Glamorous Glennis’, was the first plane to break the sound barrier.
		Concept that the speed of sound, or sonic speed (about 1,220 kph/760 mph at sea level), constitutes a speed limit to flight through the atmosphere, since a badly designed aircraft suffers severe buffeting at near sonic speed owing to the formation of shock waves.
		This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional.
	encyclopedia.farlex.com /sound+barrier (216 words)

	sound definition - Dictionary - MSN Encarta
		At sea level and freezing point, the speed of sound through the air is 1,220 km (760 mi) per hour.
		From the sound of it she's finally found a job she really likes.
		She sounded a note of caution about the likely result of the reorganization.
	encarta.msn.com /dictionary_/sound.html (453 words)

	Sound Barrier
		Sound Barrier Mass Loaded Vinyl (MLV) is the most popular noise barrier in the U.S. If you need a soundproofing barrier for your home, that is durable, economical and relatively easy to install, you can pat yourself on the back because you've found the ideal product.
		SOUND BARRIER can be laid directly on or under an existing tile or wood floor to make the floor both more comfortable and to reduce transfer of airborne noise.
		Sound Barrier vinyl may also be laid between two layers of plywood, in a sandwich fashion, in either walls or ceilings.
	www.extremesoundproofing.com /Products/Sound_Barrier/sound_barrier.htm (456 words)

	Scientific American: What happens when an aircraft breaks the sound barrier? (Site not responding. Last check: )
		Anyone who has heard an echo (sound waves reflecting off a distant surface) or been far enough away from an event to see it first and then hear it is familiar with the relatively slow propagation of sound waves.
		As the local temperature decreases, the sound speed also decreases, so for a plane flying at 35,000 feet—where the ambient temperature is —54 C—the local speed of sound is 295 meters per second (660 miles per hour).
		The change in pressure as the object outruns all the pressure and sound waves in front of it is heard on the ground as an explosion, or sonic boom.
	www.sciam.com /print_version.cfm?articleID=00049B79-93F1-1CD1-B4A8809EC588EEDF (644 words)

	Whisper Wall sound absorbing precast concrete noise walls
		Sound absorbing noise barrier finishes shall consist of symmetrical ribs one foot in length spaced two inches apart running in repetitive rows across entire surface of the sound absorbing face.
		The sound absorbing noise walls surface shall be inspected at a viewing distance, which is representative of the noise wall's normal viewing distance.
		Method of Panel Measurement: The quantity to be paid for sound absorptive panels shall be based upon the number of square feet of wall surface area supplied and calculated from the noise wall's staring station to the noise wall's ending station multiplied by the height of the wall.
	www.whisper-wall.com /specifications.html (2264 words)

	sound barrier - Articles about sound barrier
		A fireproof, lead-free sound barrier, the STC 3003 Sound Sheet can be installed in walls prior to drywall application to reduce noise,......
		Breaking the sound barrier: new electronic devices called cochlear implants are providing a sense of sound to children and adults with profound hearing
		Sound barrier: the blown film market is experiencing a steady increase in the number of applications, with a strong trend towards multi-layer solutions.
	www.wordiq.com /article/sound+barrier.html (354 words)

	Aerospaceweb.org \| Ask Us - Speed of Sound, Mach Number & Sound Barrier
		For example, an aircraft flying at Mach 0.8 is traveling at 80% of the speed of sound while a missile cruising at Mach 3 is traveling at three times the speed of sound.
		In particular, "breaking the sound barrier" is the process of accelerating through Mach 1 and going from subsonic to supersonic speeds.
		Once the speed of sound is known, the Mach number can be easily computed by dividing the airspeed of the vehicle by the speed of sound.
	www.aerospaceweb.org /question/atmosphere/q0126.shtml (1586 words)

	MDSHA: A Community Resource Guide to Sound Barriers
		Construction of a sound barrier would reduce noise levels by seven to 10 decibels at the most severely affected homes.
		To work effectively, the barrier must be high enough and long enough to block the view of the road.
		Homes on a hillside overlooking a road; buildings higher than barriers; homes scattered too far apart and openings in noise barriers for driveway connections or intersecting streets are not good areas for sound barriers.
	www.sha.state.md.us /ImprovingOurCommunity/OED/soundbar.asp (373 words)

	Jet Breaking Sound Barrier
		When an airplane travels at a speed faster than sound, density waves of sound emitted by the plane cannot precede the plane, and so accumulate in a cone behind the plane.
		What he had was a technically meticulous depiction of the sound barrier being broken July 7, 1999, somewhere on the Pacific between Hawaii and Japan.
		The change in pressure as the plane outruns all of the pressure and sound waves in front of it is heard on the ground as an explosion or sonic boom.
	www.vinland.com /SonicBoom.html (743 words)

	Breaking The Movie Sound Barrier
		That means loud 'peaking' of sound, especially the squeals, crashes, and booms of high-powered action films.
		The company is searching for a 'standard' sound level which is suitable for fans and filmmakers alike.
		Most theaters adjust sound levels to about 85 decibels (dB), and film soundtracks are mixed using that 85 dB as a reference point.
	www.personalmd.com /news/a1997080808.shtml (434 words)

	GSI Sound Stop Materials (Site not responding. Last check: )
		It is irritating and harmful primarily because of its intensity.
		At increased intensity sound energy becomes noise and physical as well as psychological harm can occur in humans when exposed to noise for periods of time depending upon the intensity.
		Barrier, ¼" or ¾" foam absorber faced with fiberglass reinforced aluminized mylar.
	www.soundstop.com /soundstop.htm (359 words)

	Acoustical Barriers Sound Barrier
		Typical applications use Sound Barrier applied to the wall, ceiling, or floor framing of a newly constructed room before the finished wall, ceiling, or floor is applied (roofing nails or fastener/washer recommended).
		For use in existing rooms, Sound Barrier is applied to the existing surface and then covered with layers of finish material (sheetrock, paneling, ceilings, flooring).
		Sound Barrier is available in either a non-reinforced version (for most uses) or a reinforced version (used when suspended vertically down from ceilings to prevent barrier from tearing under its' own weight)
	www.silentsource.com /barriers-soundbarriers.html (174 words)

	Aerospaceweb.org \| Ask Us - Chuck Yeager & the Sound Barrier
		Indeed, engineers had known for many years that the speed of sound could be passed simply because cannon balls and bullets were known to pass through the sound barrier as far back as Isaac Newton's day.
		I heard that a man jumped from a balloon at the edge of space and broke the sound barrier during his fall.
		Your site refers to the term sound barrier as "a popular part of human speech."...it is shameful to see such chauvinism in a site purporting to provide facts...
	www.aerospaceweb.org /question/history/q0011a.shtml (519 words)

	sound barrier system,green sound barrier system,rockdelta sound barrier system,rockdelta green sound barrier system (Site not responding. Last check: )
		The core of the sound barriers comprise RockDelta® stonewool being a natural inert material with excellent water absorbing and capillary characteristics, the panels being contained within a framework of galvanised steel.
		RockDelta® Barriers are available in a range of standard heights from 1.50m to 3.50m, other non-standard sizes can be manufactured to special order.
		The RockDelta® Green Sound Barrier fully accord with the new CEN Norm EN 1793 Parts 1 and 2, Classified in the Highest Class for Noise Absorption and Noise Reduction.
	www.rpcltd.co.uk /rockdelta.htm (167 words)

	channel4.com - science - speed machines
		However, when a plane approaches the speed of sound, a physical barrier is created as the plane catches up with its own pressure waves and compresses the air in front of it.
		The plane was revolutionary: a bullet-shaped fuselage with thin wings aligned to combat the devastating effects of the supersonic (greater than the speed of sound) compressibility phenomenon.
		America had won the race to break the sound barrier and a new race to reach Mach 2 was underway.
	www.channel4.com /science/microsites/S/speedmachines/soundbarrier.html (644 words)

	sound barrier
		Before 1947, it was believed that the speed of sound created a physical barrier for aircraft and pilots.
		As airplanes approach the speed of sound, a shock wave forms and the aircraft encounters sharply increased drag, violent shaking, loss of lift, and loss of control.
		The barrier was eventually shown to be mythical, however, when Chuck Yeager surpassed the speed of sound in the X-1.
	www.daviddarling.info /encyclopedia/S/sound_barrier.html (155 words)

	Sound barrier Summary
		Not only did he prove that the "sound barrier" could be broken, but he set in motion development that has led to the high-speed fighters that are critical to military defense.
		In aerodynamics, the sound barrier is the apparent physical boundary stopping large objects from becoming supersonic.
		Jackie Cochran was the first woman to break the sound barrier on May 18, 1953 in a Canadair F-86 Sabre.
	www.bookrags.com /Sound_barrier (2181 words)

	Viper Alley: F14 at 100 feet breaking the sound barrier video.... - Dodge Viper Enthusiasts! (Site not responding. Last check: )
		The boom is not only heard when the object passes the speed of sound, rather all that are in the wave's path as long as the speed is maintained or those waves are still affected.
		As I understand it, since the air in the train is traveling at 760 mph, you won't break the sound barrier inside the train so there would be no boom.
		Is the water underneath rippling from the sound waves or the aerodynamics of the F14?
	www.viperalley.com /showflat.php/Cat/0/Board/offtopic/Number/517860 (1482 words)

	sound proofing barrier mat acoustic soundproofing for machinery (Site not responding. Last check: )
		SBM can be used as a sole sound barrier layer, or as part of a multilayer composite with other materials such as sound absorbing foam and carpet.
		SAPT220 Spaced Layer Sound Barrier Mats employ self-extinguishing components and are primarily intended for the improvement of the sound insulation of sheet metal that resonates above 350Hz.
		Designed to substantially improve the, noise absorption, acoustic tiles, sound insulation, of existing walls and ceilings from a noisy neighbor, where it is, impractical to use other forms of, home sound proofing, and floating floor, sound insulation material..
	www.soundservice.co.uk /soundbarriermats.htm (1011 words)

	Stunning Photo Of Jet Breaking Sound Barrier (Site not responding. Last check: )
		What he had was a technically meticulous depiction of the sound barrier being broken July 7, 1999, somewhere on the Pacific between Hawaii and Japan.
		At sea level a plane must exceed 741 mph to break the sound barrier, or the speed at which sound travels.
		The change in pressure as the plane outruns all of the pressure and sound waves in front of it is heard on the ground as an explosion or sonic boom.
	www.rense.com /general8/boom.htm (483 words)

	Sheetblok Sound Isolation Barrier - Acoustic sound studio construction products from Auralex Acoustics.
		SheetBlok Sound Isolation Barrier is a dense, limp-mass vinyl material that is about 6dB more effective than solid lead at stopping the transmission of sound.
		It acts as a thin, dense sound barrier layer in walls, ceilings or floors and is most effective when used as one component of a multi-layered construction scheme.
		Sheetblok sound barrier shown installed on subflooring to be sandwiched between a second layer of TandG subflooring.
	www.auralex.com /sound_isolation_sheetblok/sound_isolation_sheetblok.asp (211 words)

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